11001778989 has 4 divisors (see below), whose sum is σ = 14669038656. Its totient is φ = 7334519324.

The previous prime is 11001778979. The next prime is 11001779003. The reversal of 11001778989 is 98987710011.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11001778989 - 2⁹ = 11001778477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11001778919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1833629829 + ... + 1833629834.

It is an arithmetic number, because the mean of its divisors is an integer number (3667259664).

Almost surely, 2^11001778989 is an apocalyptic number.

It is an amenable number.

11001778989 is a deficient number, since it is larger than the sum of its proper divisors (3667259667).

11001778989 is an equidigital number, since it uses as much as digits as its factorization.

11001778989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3667259666.

The product of its (nonzero) digits is 254016, while the sum is 51.

The spelling of 11001778989 in words is "eleven billion, one million, seven hundred seventy-eight thousand, nine hundred eighty-nine".